Due to publisher restrictions, you are only allowed to copy a certain percentage of an eBook over a set time period. Try again in a few hours or tomorrow and you will be able to copy more.
Please note, however, that some eBooks have an overall copy limit, meaning that after a certain point you will not be able to copy any more text. These limits vary between publishers, but they will generally be displayed during the copying process.
If you are still have questions, please contact our Support Team.